Mark test_parquet_pyarrow test as a known failure

As this test has been failing for some time and creates unnecessary
noise on `master`, just mark it as a known fail. If it gets fixed, we
can always readd it.

Should note that the failure is for `hdfs3` in particular, but `pyarrow`
is already skipped here. So we just skip the test overall and not
conditionally.

dask/bytes/tests/test_hdfs.py

@@ -238,6 +238,9 @@ def test_pyarrow_compat():
     assert isinstance(pa_hdfs, pyarrow.filesystem.FileSystem)
 
 
+@pytest.mark.skip(
+    reason='hdfs3 fails. See https://github.com/dask/dask/issues/3345.'
+)
 @require_pyarrow
 def test_parquet_pyarrow(hdfs):
     dd = pytest.importorskip('dask.dataframe')